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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[COMPASS-1663] Investigate schema analysis consumes a lot of memory</title>
                <link>https://jira.mongodb.org/browse/COMPASS-1663</link>
                <project id="13182" key="COMPASS">Compass </project>
                    <description>&lt;p&gt;Certain collections consumes a lot of memory during schema analysis as HELP-4695 indicates.&lt;/p&gt;

&lt;p&gt;This ticket is to track and investigate the cause for higher memory consumption in some collections and if there are any potential solutions.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/HELP-4695?focusedCommentId=1637700&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-1637700&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;Reproduction steps&lt;/a&gt; with mgenerate file attached to this ticket.&lt;/p&gt;

</description>
                <environment></environment>
        <key id="412644">COMPASS-1663</key>
            <summary>Investigate schema analysis consumes a lot of memory</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13203">Gone away</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="satyendra.sinha@mongodb.com">Satyendra Sinha</reporter>
                        <labels>
                    </labels>
                <created>Fri, 4 Aug 2017 00:53:56 +0000</created>
                <updated>Wed, 10 Jan 2024 23:07:24 +0000</updated>
                            <resolved>Thu, 9 Jan 2020 16:33:24 +0000</resolved>
                                                                    <component>Performance</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1649401" author="brian.blevins" created="Wed, 16 Aug 2017 12:53:52 +0000"  >
&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sam.weaver&quot; class=&quot;user-hover&quot; rel=&quot;sam.weaver&quot;&gt;sam.weaver&lt;/a&gt;,&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;What is the consumption like when you double the number to 50,000 documents?&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;I have not investigated the memory utilization against number of documents in the collection.  My expectation is that the complexity of the documents is a much larger factor than the count for driving memory utilization.  This is one difficulty in troubleshooting because we do not know the precise layout of the customer documents in most cases.&lt;/p&gt;

&lt;p&gt;Schema analysis time complexity is impacted by the &lt;b&gt;network latency&lt;/b&gt;.   You can see some results in my internal only comment in &lt;a href=&quot;https://support.mongodb.com/case/00448175&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;00448175: Compass is Unusable&lt;/a&gt;.  Time/delay is also impacted by whether the sample size is greater than or less than 5% of the collection size because this drives whether Compass uses $sample versus reservoir sampling.&lt;/p&gt;


&lt;p&gt;Regards,&lt;br/&gt;
Brian&lt;/p&gt;</comment>
                            <comment id="1648774" author="brian.blevins" created="Tue, 15 Aug 2017 17:28:09 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=thomasr&quot; class=&quot;user-hover&quot; rel=&quot;thomasr&quot;&gt;thomasr&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;The customer in &lt;a href=&quot;https://support.mongodb.com/case/00432392&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;00432392: Using too much memory for large collection&lt;/a&gt; is Memorial Sloan-Kettering Cancer Center.&lt;/p&gt;

&lt;p&gt;The complaint is about the total Compass memory usage on a Windows 7 desktop.&lt;/p&gt;

&lt;p&gt; &lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;a id=&quot;163349_thumb&quot; href=&quot;https://jira.mongodb.org/secure/attachment/163349/163349_MongoDB.COMPASS.Task.Manager.20170727.1551.JPG&quot; title=&quot;MongoDB.COMPASS.Task.Manager.20170727.1551.JPG&quot; file-preview-type=&quot;image&quot; file-preview-id=&quot;163349&quot; file-preview-title=&quot;MongoDB.COMPASS.Task.Manager.20170727.1551.JPG&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/thumbnail/163349/_thumb_163349.png&quot; style=&quot;border: 0px solid black&quot; role=&quot;presentation&quot;/&gt;&lt;/a&gt;&lt;/span&gt; &lt;/p&gt;

&lt;p&gt; &lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;a id=&quot;163350_thumb&quot; href=&quot;https://jira.mongodb.org/secure/attachment/163350/163350_MongoDB.COMPASS.Task.Manager.20170727.1558.JPG&quot; title=&quot;MongoDB.COMPASS.Task.Manager.20170727.1558.JPG&quot; file-preview-type=&quot;image&quot; file-preview-id=&quot;163350&quot; file-preview-title=&quot;MongoDB.COMPASS.Task.Manager.20170727.1558.JPG&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/thumbnail/163350/_thumb_163350.png&quot; style=&quot;border: 0px solid black&quot; role=&quot;presentation&quot;/&gt;&lt;/a&gt;&lt;/span&gt; &lt;/p&gt;

&lt;p&gt;However, that customer is not able to provide any sample data due to HIIPA rules.  So, our testing is not apples-to-apples with the customer&apos;s dataset.&lt;/p&gt;

&lt;p&gt;Additionally, the customer appears to be running Compass on an 8 GB RAM desktop.&lt;/p&gt;

&lt;p&gt;I have asked the customer to reduce the sample size and that request has been ignored.&lt;/p&gt;

&lt;p&gt;The sample data provided actually came from complex sample documents provided by a different customer where I noticed memory usage was also high.  See &lt;a href=&quot;https://support.mongodb.com/case/00448175&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;00448175: Compass is Unusable&lt;/a&gt;.&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt; What is the impact on the customers?  Or are they unable to use Compass because of this?&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;The customer at &quot;Memorial Sloan-Kettering Cancer Center&quot; opened the support case with:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;Secondly, from the user&apos;s workstation perspective, COMPASS seems to be a very memory intensive application. Is there any plan to address this in the future?  We see the benefit of COMPASS. However, due to the limitations outlined above, our developers are not using it as much.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;The latest update from the customer regarding Compass schema analysis:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;COMPASS came back after ~10 minutes but it did not hang this time.&lt;/p&gt;&lt;/blockquote&gt;
</comment>
                            <comment id="1648619" author="sam.weaver@10gen.com" created="Tue, 15 Aug 2017 15:16:51 +0000"  >&lt;p&gt;What is the consumption like when you double the number to 50,000 documents? Does 50,000 docs consume 880MB? Is it exponential growth? Does this only happen on &quot;schema analysis&quot; or on any other screen? What about just showing the docs in the Documents tab?&lt;/p&gt;</comment>
                            <comment id="1648270" author="thomasr" created="Tue, 15 Aug 2017 04:30:56 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=brian.blevins&quot; class=&quot;user-hover&quot; rel=&quot;brian.blevins&quot;&gt;brian.blevins&lt;/a&gt; we haven&apos;t made any significant progress on this issue yet. What is the impact on the customers? Are they just curious why it&apos;s using that much memory? Or are they unable to use Compass because of this?&lt;/p&gt;</comment>
                            <comment id="1648269" author="thomasr" created="Tue, 15 Aug 2017 04:29:34 +0000"  >&lt;p&gt;I recreated the collection with 25,000 documents with the template &lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/162559/162559_memory_issue.json&quot; title=&quot;memory_issue.json attached to COMPASS-1663&quot;&gt;memory_issue.json&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt;.&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;mgeneratejs memory_issue.json -n 25000 | mongoimport -d perf -c compass_1663_memory&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Some more diagnostic info from mongodb-schema: &lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;mongodb-schema localhost:27017 perf.compass_1663_memory -n 1000 --no-output --stats --repeat 10&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;execution count: 10&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;mean time: 23717.50ms (individual results: 23002,24164,24283,22122,23590,24701,23264,23509,23711,24829)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;stdev time: 777.49ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;toplevel fields: 50&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;branching factors: [83,50,9,3,3]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;schema width: 148&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;schema depth: 3&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;A single run with mongodb-schema consumed about 440MB of memory in the process (as observed in Activity Monitor): &lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/163312/163312_compass-1663-memory.png&quot; width=&quot;70%&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt; &lt;/p&gt;</comment>
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